#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
int main()
{
	int a = 0;
	int b = 0;
	int c = 0;
	int d = 0;

	scanf("%1d%1d%1d%1d", &a, &b, &c, &d);

	printf("%d%d%d%d", d, c, b, a);


	return 0;
}













